A new, transplantable tumor of the Syrian golden hamster has been described. This tumor, a leiomyosarcoma, arose in a male hamster which had been previously implanted subcutaneously with a cholesterol pellet. It grows progressively in 100 per cent of the hosts following subcutaneous implantation. Metastases have been observed in several organs.


This investigation was supported in part by an institutional grant of the American Cancer Society and by a grant from the National Cancer Institute, National Institutes of Health, United States Public Health Service, and the Mass. Division of the American Cancer Society.

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